net: Update the include paths of base/string_piece.h to its new location.

net/quic/crypto/curve25519_key_exchange_test.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/crypto/curve25519_key_exchange.h"
 
 #include "base/memory/scoped_ptr.h"
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 #include "net/quic/crypto/quic_random.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::StringPiece;
 using std::string;
 
 namespace net {
 namespace test {
 
 // SharedKey just tests that the basic key exchange identity holds: that both
@@ skipping 15 matching lines @@
 
     string alice_shared, bob_shared;
     ASSERT_TRUE(alice->CalculateSharedKey(bob_public, &alice_shared));
     ASSERT_TRUE(bob->CalculateSharedKey(alice_public, &bob_shared));
     ASSERT_EQ(alice_shared, bob_shared);
   }
 }
 
 }  // namespace test
 }  // namespace net